It seems that you would like a specific role, which you can add to 2 members of a route relation (I'd add it to the two ways around your imaginary gap).
If you do it that way, you don't need a non-existing member. And you don't need to add nodes to a relation which consists of ways. This doesn't just have implications for the validator, but it also might involve changing the code which sorts the member ways. Polyglot
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